1,1

Odd nonprime digits are 1 or 9 and even prime digit = 2.

The definition presumably implies that the number of odd nonprime digits and the number of even prime digits are both larger than zero. [From R. J. Mathar, Feb 26 2009]

Table of n, a(n) for n=1..52.

Cf. A141468.

Sequence in context: A137480 A316267 A228766 * A218043 A048344 A039402

Adjacent sequences: A157154 A157155 A157156 * A157158 A157159 A157160

nonn,base,less

Juri-Stepan Gerasimov, Feb 24 2009

Missing numbers added by R. J. Mathar, Feb 26 2009

approved